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Voxelmanip: Do not emerge or blit to blocks over map gen limit
Placing a structure that extends into mapblocks that extend past map_gen_limit causes a crash. For example a sapling growing at the world edge which adds leaves beyond the edge, or placing a structure using the lua voxelmanip, or placing a schematic or l-system tree. Do not run the 'load_if_inexistent' block of code if the mapblock is over limit, this also marks the mapblock with the flag VMANIP_BLOCK_DATA_INEXIST which later prevents blitting back those mapblocks. This fix therefore uses existing functionality by having the same effect as the 'load_if_inexistent' bool being false.
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